Q6 of 53 Page 29

Person having genotype IA IB would show the blood group as AB. This is because of:

ABO blood grouping in humans is controlled by the gene I. The gene (I) has three alleles IA,IB and i. Each person posses any two of the three I gene alleles. IA and IB are completely dominant over i. Which means when IA and i are present, IA expresses (because i do not produce any sugar) and when IB and i are present, IB expresses but when IA and IB are present, together they both will express their own type of sugars: this is because of Co-dominance.

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